PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: Platelet count at least 75,000/mm3 Absolute granulocyte count at least 1,000/mm3 No active coagulopathy requiring therapeutic anticoagulation Hepatic: SGOT and SGPT no greater than 2.5 times normal Bilirubin no greater than 1.5 times normal (3 times normal if Gilbert's disease present) Renal: Creatinine no greater than 1.5 mg/dL OR Creatinine clearance at least 60 mL/min Cardiovascular: No history of unstable or newly diagnosed angina pectoris No myocardial infarction within past 6 months No New York Heart Association class II-IV heart disease Other: No serious concurrent medical illness HIV negative Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception during and for 3 months after study